How Roger Federer became one of the few sports figures to make $1 billion.

On Thursday, one of tennis' greatest players, Roger Federer, announced his retirement. He was most dominating between 2003 and 2007,

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winning 10 Majors, including Wimbledon five times. He won 20 Grand Slam tournaments.

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Federer earned more than $1 billion in his career, including $870 million off the court and $130.6 million from playing tennis.

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He is one of just six athletes to have ever earned more than $1 billion, according to Forbes.

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Federer remarked in his announcement of his retirement, "I am 41 years old, I have played more than 1,500 matches over 24 years,

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and tennis has treated me more kindly than I ever would have dreamed.

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His success off the court was obviously a continuation of his skill there. But according to marketing experts, there was more to it than just being a great player.

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He was more enticing to businesses because of the way he held himself, which was distinguished by a certain demeanor and nobility.

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During the past roughly 20 years, more than a dozen companies have partnered with Federer,

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a Swiss citizen, most notably Wilson Sporting Goods, Nike, Rolex, and Mercedes-Benz.

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